Top answers

Biology
A Level

How does genetic engineering work?

It is a simple idea whereby we take new working genes, named wild types, and replace the faulty genes of some ones cells. This means the cells will then take up the new DNA and make a functional version o...

ES
Answered by Edward S. Biology tutor
5840 Views

Describe the mechanism of mammalian breathing.

The process of breathing is made up of two components:

  • Inhalation
  • Exhalation

Inhalation is the process of filling the lungs with air. As they fill they expand and so th...

RR
Answered by Rebecca R. Biology tutor
16647 Views

The black mamba’s toxin kills prey by preventing their breathing. It does this by inhibiting the enzyme acetylcholinesterase at neuromuscular junctions. Use your knowledge of muscle contraction to explain how this prevents breathing.

By inhibiting the enzyme acetylcholinesterase, the neurotransmitter acetylcholine does not get broken down. This causes acetylcholine to build up in the synapse between the motor neurones and muscles of r...

TC
Answered by Tashi C. Biology tutor
8897 Views

Outline the importance of the junctions between neurones in the functioning of the nervous system

DEFINE: Key words What is a junction, what is a neurone and what is the nervous system? So, the nervous system connects all the nerve cells and fibres which transmit nerve impulses from one part of the bo...

NK
Answered by Natasha K. Biology tutor
6698 Views

What is negative feedback?

Firstly you have a change away from optimum conditions, for instance a decrease in internal body temperature, which is detected by a receptor. The receptor relays this infromation down the communication p...

JB
Answered by Josephine B. Biology tutor
2615 Views

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